Logitech Quickcam Fusion

Hi, I'm new to the boards. I just bought the Logitech quickcam Fusion (new uvc compliant). I have a new mac pro running 10.4.10. I tried using ichat but it would not recognize the microphone on the camera. Only have options for line in and digital in. Frustrated, I plugged the camera into my Powerbook G4 (running 10.4.9) and it worked perfectly with ichat. Any ideas on why Mac Pro won't recognize the mic? Kind of frustrating since this is the cam Apple sells on the store. Thanks in advance!